You might look at a friend's copy of the "Cowboy Chronicle", monthly newspaper of SASS. If checkered Remington grips are available, its likely on "their street".
I cut a strip of 3M Wet-n-Dri metal sandpaper, 240 grit, which was positioned on the backstrap and was held in place by a 1/4" of sandpaper "trapped" between the backstrap and the grip panels on each side. That helps, and cheap.
Another thing that works is powdered rosin. Stop at a sports store and pick a container. Put some on your hands and it firms up the grip on your revolver. A container will probably last a couple of years, depending on how much you shoot. We use it regularly on the National Pistol Line at Friendship.
The only other alternative would be to pay a gunsmith to hand-checker your grips, which might set you back between $50-$100.
Hope this helps,